1207.6340 (M. G. Holder et al.)

How chemical pressure affects the fundamental properties of rare-earth
pnictides: an ARPES view    [PDF]

M. G. Holder, A. Jesche, P. Lombardo, R. Hayn, D. V. Vyalikh, K. Kummer, S. Danzenbächer, C. Krellner, C. Geibel, E. D. L. Rienks, S. L. Molodtsov, C. Laubschat

Angle-resolved photoelectron spectroscopy, supplemented by theoretical calculations has been applied to study the electronic structure of heavy-fermion material CeFePO, a homologue to the Fe-based high-temperature superconductors, and CeFeAs_0.7P_0.3O, where the applied chemical pressure results in a ferromagnetic order of the 4f moments. A comparative analysis reveals characteristic differences in the Fe-derived band structure for these materials, implying a rather different hybridization of valence electrons to the localized 4f orbitals. In particular, our results suggest that the ferromagnetism of Ce moments in CeFeAs_0.7P_0.3O is mediated mainly by Fe 3d_xz/yz orbitals, while the Kondo screening in CeFePO is instead due to a strong interaction of Fe 3d_3z^2-r^2 orbitals.

View original: http://arxiv.org/abs/1207.6340